Rock drill



May 21, 1929. H w|LHELM 1,713,859

' ROCK DRILL Filed April 22, 1526 A B INVENTOR B BY 1/! bllfi'lhelm HZSA ORNEK Patented May El, 1929.

lll rll'l lillh the l r r' l hld l' @FFEQE.

RUSSELL H. WILHELM, OF EASZON, EENNSYLVANIA, ASEETGN'OB TO INGERSOLL-BAND COMEANY, 01E JERSEY CITY, NEW JERSEY, A COHPORATIDN OF NEW JERSEY.

RUGB DRILL.

Application filed April 22,

This invention relates to rock drills, but more particularly to a distributing valve for fluid actuated rock drills.

The objects of the invention are to obtain a quickand pos tive valve action by utilizing the exhaust pressure fluid from the cylinder for throwing the valve.

Other; objects will be in part obvious and in part pointed out hereinafter.

I The invention consists of the combination of elements and arrangement of parts substantially as hereinafter described and more particularly pointed out in the appended claims and illustrated in the accompanying drawings, in which Figure 1 is a longitudinal sectional elevation of a portion of a rock drill showing the valve in position for admitting pressure fluid into the rearward end of the cylinder for impelling the piston forwardly,

Figure 2 is a view similar to Figure 1 showing the valve in position to admit pressure fluid to the front end of the cylinder for returning the piston, a'ndl igure 3 is a detail view 01" the inner end of the valve bushings.

Referring to the drawings, the invention.

is shown. embodied in a rock drill havinga cylinder A in which is arranged a reciprocatory piston B. The piston B in this in stance is provided with a forwardly extending nose D cooperating slidably with a front cylinder washer E which forms a closure for the front end oi the cylinder A... A closure for the rearward end of the cylinder A in this instance provided in the term ot a back cylinder *asher F which also forms an abut meat for a rotation ratchet G and is bored as at H for the reception ()"l a rifle bar 3. The rifle bar J interlocks slidably with a rifle nut K carried by the piston B in the rearward end of said piston. A ratchet head L preferably tlormed integrally with the rifle bar carries suitable pawl devices 0 wl'iioh cooperate with the rotation ratchet G in. a well known manner for holding the rifle bar stationary during one of the stroliesol the piston and for permitting the rifle bar to rotote with the piston during the other stroke of the piston.

At. the rearward end ol' the cylinder A; is arranged a back head P having a recess (.1 r the reception of the rotation ratchet (i to r-oope f tln hart: cy d 1926. Serial No. 103,855.

with respect to the cylinder A. The back head P may be of the type usually provided for hand held tools as indicated in the drawings, although not necessarily so, since the inven tion not limited in its use to any particular type of drill. A washer It may be insorted in the rearward end of the recess Q to form an abutment for the rotation ratchet G and ratchet head L and is bored to receive a portion of the rifle bar J for maintaining said rifle bar centrally with respect to the rotation ratchet and other parts wherewith it cooperates.

Disposed on the cylinder A, and preferably longitudinally thereof as illustrated, is a valve chest El having a chamber T formed t ierethrough. The chamber T is preferably of substantially the same diameter throughout its length and may be recessed at its-ends as at U and V to receive flanges W and X of valve bushings Y and Z. The valve bushings Y and Z are inserted in opposite ends of the chamber T and may be held against'endwise movement by any suitable means. In the present instance this is accomplished by means of bolts 1) and nuts 0 which may be arranged on opposite sides of the valve chest 8' to clamp plates (Z firmly against the ends of the bushings Y and Z.

To the end that the bushings Y and Z may be held against rotation within the chamber T, pins 6 are inserted in the flanges of the bushings to cooperate with suitable slots formed in the valve chest S.

In accordance with the present invention, a pressure actuated valve 9 is arranged in the bushings Y and Z for distributing the pressure fluid to the ends of the cylinder. The valve g is provided :with a hollow bore h which extends throughout the length of the valve thus making the valve tubular in form. The pressure fluid distributed by the valve may be conveyed to the chest through a connection j preferably formed at one end of the valve chest S and communicating with the bore it of the valve through a recess 72 formed" near the outer end of the bushing Z.

It will be noted that the interior or bore h of the valve is at all times exposed to live pressure fluid as are also the ends of the valve. Tn the present instance the pressure fluid to the ends of the cylinder may pass through radial ports 0 and and passages and r to th d front ends ctively of i a and pass to the atmosphere through a main exare formed between the cylinder A and the valve chamber T for exhausting-the pressure fluid from the front and rearward ends of the cylinder into the chamber T. The pressure fluid thus'exhausted from the cylinder may haust port a, preferably leading from the central portion of the chamber T. A central flange v carried by the valve 9 may reciprocatebetween the inner ends Y and Z of the bushin s Y and Z for the purpose of estab- V lishing communication between the exhaust that when the valve 9 is in one of its limiting positions, the grooves mayv register radial ports in the valve.

Leading from the'annular grooves is a longitudinal passage z of suitable cross seewith the tional area and so positioned that" pressure fluid issuing therefroinw1ll be directed against the forward face of the flange-o of the valve. A similar passage 2 leading from the groove 3/ is formed in the bushing Z to direct a stream of pressure fluid. against the opposite face of the flangeo when the valve is thrown forwardly to the position indicated 7 in Figure 2.'

Inthe operation of the device, with the valve'g' and the piston Bin the positions indicated in Figure 1, pressure fluid entering the inlet connection and the recess will pass into the bore h of the valve and thence through the radial ports 0 and thepassage Q 4 'to the rearward end of the cylinder A to impel the piston forwardly. As, the piston proceedsin a forwardly direction the air in the forward end of the cylinder may escape through the exhaust assage s and through the valve chamber an'c the main exhaust port a to the atmosphere. After the exhaust passage s has been covered by the piston B, the, air remaining-1n the front end of the cylinderwillbe compressed. by the piston. At

about theitiine' the piston, B reaches its for ward limiting position, the exhaust portt will be uncovered by the piston and the pressure fluid utilized for impellingthe piston forwardly will pass through the exhaust passage t and acting against the rearward face of the flange 0) of the valve will throw the valve forwardly to the positionillustratedin Figure 2. It will thus be seen that a clear path is established between the rearward end of the cyl nder and the atmosphere for the escape of exhaust pressure fluid.

During the, forward movement of the piston B and while the valve is still in the position in Figure 1, the radial port 39, will be in re 'istr -w1th the annular move as. In

this position of the valve, pressure fluid will flow through these channels and through the passage .2 to act against the forward :face of the flange '0 for holding the valve firmly against the inner face of the bushing Z.

After the valve has been thrown forwardly to the position shown in FigureQ, the radial ports 7) will be moved into registry with the inlet port 9 and pressure fluid will flow to the front end of the cylinderfor'returning the piston. In this position of the valve the radial ports 0 willregister with the annular port y and pressurefiuid will be admitted through the'passage 2 to act against-the rear-' ward face of the flange '0' for holding the valve in its forward limiting position. The valve 9 will thuslbe held against the bushing Y until the piston B has overrun the exhaust passage 3. The pressure fluid utilized for inipelling the piston rearwardly may then pass into the valve chamber T to act against the front face of the flange ofor throwing the valve rearwardly to the position illustrated in Figurel, thus completing the cycle of operations. v V r The foregoing described valve has been found to functionin an unusually efiieient manner. It is quick and positive in its'action and of simple and inexpensive construction. The efiiciency of the valve is due, in a large measure, to the manner in which the exhaust pressure fluid 1s utllized for. throwing the valve and, in part, to the fact that after the.

valve has been thrown-toits limiting position,a stream of live pressure fluid acts constantly against the flange for holding the valve in thrown position.

I claim:

In arock drill, the combinationv of a cylinder, a piston in the cylinder, a valve chest having a chamberand a main exhaust port, said valve, chest having'inlet and exhaust passages leadingto the cylinder, a

pressure actuated valve in the chamber to controltheinlet and exhaust passages, said valve being hollow throughout its length and constantly exposed to live pressure fluid of equal pressures at itsends, and a flange on the valve exposed to pressure fluid from the cylinder for throwingthe valve. 7

QPIn a roclrdrill, the combination of a cylinder, a piston in the cylinder, a valve chest having a chamber and a main exhaust port, said valve chest having inlet and exhaust passages leading to the cylinder, a tubular valve in the chamber through which pressure fluid passes and having ports to register with the 1nlet passages for admitting pressure fluid to the cylinder for, actuata ing the piston, and a flange on the valve con trolling communication between the exhaust port and the exhaust passages and against whichexhaust pressure fluid from the cylinder acts to throw the valve.

,3. In a rock drill, the combination of a cylinder, a piston in the cylinder, a valve chest having a chamber and a main exhaust port, said valve chest having inlet and exhaust passages leading to the cylinder, a tubular valve in the chamber constantly exposed interiorly and at its ends to live pressure fluid and having radial ports to register with the inlet passages, and a central flange on the valve exposed to exhaust pressure fluid from the cylinder whereby the valve is thrown said valve chest having annular grooves to register with the radial ports, and passages leading from the annular grooves to the exhaust passages for directing pres sure fluid against the flange to hold the valve in thrown position.

4. In a rock drill, the combination of a cylinder, a piston in the cylinder, a valve chest having a chamber and a main exhaust port, said valve chest having inlet and exhaust passages leading to the cylinder, a tubular valve in the chamberconstantly exposed interiorly and at its ends to live pressure fluid and. having radial ports to register with the inlet passages, and a central flange on the valve exposed to exhaust pressure fluid from the cylinder whereby the valve is thrown, said valve chest having annular grooves between the inlet and exhaust passages to register with the radial ports, and longitudinal passages leading from the annular grooves to the exhaust passages for directing pressure fluid against the flange to hold the valve in thrown position.

In testimony whereof I have signed this specification.

RUSSELL H \VILHELM. 

